Re: A couple of questions about gtkmm

[Emanuele Oriani <emaentra tiscali it>]

Thanks sledge hammer and Ian.

I've dove into it and actually managed to do what I wanted with the 
Notebook widget:
I did use the set_resizable() (..very straightforward -once you find it 
out-).
For the right alignment of numbers I did the following (it was not 
straightforward to find...):

tw->get_column_cell_renderer(4)->property_xalign() = 1.0;
tw->get_column_cell_renderer(5)->property_xalign() = 1.0;

Now, I know that column 4 and 5 do exist, so I just set it on the right. 
The point is, should I implement a check on the pointer returned by 
get_column_cell_renderer(), isn't it (if it's NULL wouldn't be good at 
all)...
What I tried the first time was this:

Gtk::TreeViewColumn    *pColumn = tw->get_column(4);
if (pColumn) {
           Gtk::CellRendererText    *render = Gtk::manage(new 
Gtk::CellRendererText);
           render->property_xalign() = 1.0;
           pColumn->set_renderer(*render, _cf_data._col_value);
}

But I kept having the following error:

Gtk-CRITICAL **: gtk_tree_view_column_cell_layout_add_attribute: 
assertion `info != NULL' failed

What was I doing wrong? Why can't I set the cell rendered to a new type 
of object? What's possibly wrong with this approach form a logical point 
of view?

Now, going back to point 1:
If I put as example, 3 Label into a VBox:

vb->pack_start(*Gtk::manage(new Gtk::Label("a")), Gtk::PACK_SHRINK);
vb->pack_start(*Gtk::manage(new Gtk::Label("bb")), Gtk::PACK_SHRINK);
vb->pack_start(*Gtk::manage(new Gtk::Label("ccc")), Gtk::PACK_SHRINK);

I see the horizontal alignment as centered.
I'd like all of them to be aligned on the right hand side of the VBox. 
Is there a way to specify them as the cell renderers?
How can I do this?
I've tried the example the Ian suggested but it's valid only for 
ButtonBox types...
I mean, doesn't it make sense for any type box to specify the horizontal 
alignment?

Thanks again,
Regards,

E. Oriani

sledge hammer wrote:
> > 2) When I use a TreeView with a ListStore, how can I do the following:
> > - Align on the right hand side the content of some columns (for example
> > numerical columns)
>
> One approach is this: Use a Gtk::CellRendererText and then use 
> property_markup 
> <http://gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1CellRendererText.html#c5a5082f96afe81faa0f3ac4fd0e0c7f> 
> ()
>
> > - Make the columns resizable by the user
>
> On the TreeView widget use get_column 
> <http://gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1TreeView.html#513e50ad0acdd817d1a443f1eaa3debe> 
> (int n) to get a pointer to the column. Then use: 
> Gtk::TreeViewColumn::set_resizable() on that.
>
> > - Implement a conditional rendering of a column (should I use a
> > CellRendererText implementing a Label with Pango format?)
>
> If you use CellRendererText then take a look on 
> here->http://gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-treeview.html 
> on the topic "Specifying CellRenderer Details". And then use the 
> property_visible 
> <http://gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1CellRenderer.html#be91e2d555a940bb3214be7bf04210a6> 
> () of the CellRendererText
>
> I hope I didn't confuse you. At first I was confused at how TreeView 
> works...
> About the documentation part: you're dead on.
>
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